| 1 | #include "nmea0183.h"
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| 2 | #pragma hdrstop
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| 3 |
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| 4 | /*
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| 5 | ** Author: Samuel R. Blackburn
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| 6 | ** Internet: sam_blackburn@pobox.com
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| 7 | **
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| 8 | ** You can use it any way you like as long as you don't try to sell it.
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| 9 | **
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| 10 | ** Copyright, 1996, Samuel R. Blackburn
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| 11 | **
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| 12 | ** $Workfile: gxa.cpp $
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| 13 | ** $Revision: 5 $
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| 14 | ** $Modtime: 10/10/98 2:44p $
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| 15 | */
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| 16 |
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| 17 |
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| 18 |
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| 19 | GXA::GXA()
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| 20 | {
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| 21 | Mnemonic = "GXA";
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| 22 | Empty();
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| 23 | }
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| 24 |
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| 25 | GXA::~GXA()
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| 26 | {
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| 27 | //Mnemonic.Empty();
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| 28 | Empty();
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| 29 | }
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| 30 |
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| 31 | void GXA::Empty( void )
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| 32 | {
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| 33 | //UTCTime.Empty();
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| 34 | Position.Empty();
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| 35 | //WaypointID.Empty();
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| 36 | SatelliteNumber = 0;
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| 37 | }
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| 38 |
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| 39 | BOOL GXA::Parse( const SENTENCE& sentence )
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| 40 | {
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| 41 | /*
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| 42 | ** GXA - TRANSIT Position - Latitude/Longitude
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| 43 | ** Location and time of TRANSIT fix at waypoint
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| 44 | **
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| 45 | ** 1 2 3 4 5 6 7 8
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| 46 | ** | | | | | | | |
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| 47 | ** $--GXA,hhmmss.ss,llll.ll,a,yyyyy.yy,a,c--c,X*hh<CR><LF>
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| 48 | **
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| 49 | ** 1) UTC of position fix
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| 50 | ** 2) Latitude
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| 51 | ** 3) East or West
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| 52 | ** 4) Longitude
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| 53 | ** 5) North or South
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| 54 | ** 6) Waypoint ID
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| 55 | ** 7) Satelite number
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| 56 | ** 8) Checksum
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| 57 | */
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| 58 |
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| 59 | /*
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| 60 | ** First we check the checksum...
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| 61 | */
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| 62 |
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| 63 | if ( sentence.IsChecksumBad( 8 ) == True )
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| 64 | {
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| 65 | SetErrorMessage( "Invalid Checksum" );
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| 66 | return( FALSE );
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| 67 | }
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| 68 |
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| 69 | UTCTime = sentence.Field( 1 );
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| 70 | Time = sentence.Time( 1 );
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| 71 | Position.Parse( 2, 3, 4, 5, sentence );
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| 72 | WaypointID = sentence.Field( 6 );
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| 73 | SatelliteNumber = (WORD) sentence.Integer( 7 );
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| 74 |
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| 75 | return( TRUE );
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| 76 | }
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| 77 |
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| 78 | BOOL GXA::Write( SENTENCE& sentence )
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| 79 | {
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| 80 | /*
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| 81 | ** Let the parent do its thing
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| 82 | */
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| 83 |
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| 84 | RESPONSE::Write( sentence );
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| 85 |
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| 86 | sentence += UTCTime;
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| 87 | sentence += Position;
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| 88 | sentence += WaypointID;
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| 89 | sentence += Hex( SatelliteNumber ); // Thanks to Chuck Shannon, cshannon@imtn.tpd.dsccc.com
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| 90 |
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| 91 | sentence.Finish();
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| 92 |
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| 93 | return( TRUE );
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| 94 | }
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| 95 |
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| 96 | const GXA& GXA::operator = ( const GXA& source )
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| 97 | {
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| 98 | UTCTime = source.UTCTime;
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| 99 | Time = source.Time;
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| 100 | Position = source.Position;
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| 101 | WaypointID = source.WaypointID;
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| 102 | SatelliteNumber = source.SatelliteNumber;
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| 103 |
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| 104 | return( *this );
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| 105 | }
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